Steam-generator



H. 0. FISH.

STEAM GENERATOR.-

(No Model.)

No. 480,365. Patented Aug. 9, 1892.

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UNITED STATES PATENT OFFICE.

HENRY O. FISH, OF WORCESTER, MASSACHUSETTS.

STEAM -G EN ERATOR.

SPECIFICATION forming part of Letters Patent No. 480,365, dated August 9, 1892.

Application filed November 22, 1888. Serial No. 291,534. (No model.)

To all whom it may concern.-

Be it known that I, HENRY O. FISH, a citizen of the United States, and a resident of Worcester, in the county of Worcester and State of Massachusetts, have invented a new and useful Improvement in Steam-Generators, of which the following is a specification, accompanied by drawings, in which Figure 1 represents a view in elevation of a steam-generator embodying my invention, the outer shell or case inclosing the boiler and fire-pot being shown in sectional view. Fig. 2 represents the lower side of the boiler, and Fig 3 shows a vertical central sectional view of the boiler.

Similarletters refer to similar parts in the several figures.

My invention relates to that class of steamgenerators in which a water receptacle or boiler is placed over the fire-pot, which is supported upon the ash-box; and it consists in the novel method of supporting the boiler, as hereinafter described, and specifically set forth in the claims.

In the accompanying drawings, A denotes the ash-box; B the fire-pot, resting by its lower edge upon the upper side of the ash-box and over the opening in the ash-box occupied by the grate in the manner common in steamgenerators of this class and also in hot-air furnaces.

0 denotes the opening in the side of the firepot, through which fuel is fed to the fire. The fire-pot at the opening Ois connected with the outer casing or shell by an iron trough D, (shown in sectional view in Fig. 1,) inclosing the bottom and sides and leaving the top open, as illustrated in Fig. 1.

E denotes a hemispherical shell having a flange F around its edge, to which asteel crownsheet G is attached by means of bolts mm a, Figs. 1 and 2. To the lower side of the crownsheet I attach the lugs II, arranged at equal spaces around the edge of the crown-sheet and projecting radially outward to receive the rods J J, which. serve as legs to support the boiler. The rods J are screw-threaded at their upper ends and pass through the lugs H, which rest upon the nuts K. The lower ends of the rods J rest upon the upper side of the ash-box A and the crown-sheet is supported a short distance above the upper edge of the fire-pot to allow the products of combustion to pass between the crown-sheet and fire-pot and upward. around the sides of the boiler within the shell or case M and through the smokestack N to the flue or chimney.

The vertical height of the boiler can be readily adjusted by means of the nuts K upon the screw-threaded rod J and the space between the crown-sheet and fire-pot varied, thereby controlling the force with which the upward current of heated air shall impinge upon the under side of the crown-sheet.

My improved method of supporting the boiler allows a continuous opening around the entire outer edge of the fire-pot, thus equally heating all sections of the crown-sheet, as its entire outer edge is brought into contact with a uniform current of hot air. The fire-pot is also relieved of the weight of the boiler and its contents, allowin git to expand and contract freely independently of a joint between the boiler and upper edge of the fire-pot. As the fire-pot is unattached to either the ash-box or boiler and is free from the weight of the boiler, it may be taken out and replaced without disturbing the setting of the boiler.

I do not herein claim the construction of the boiler by means of a hemispherical shell and attached crown-sheet as shown in the accompanying drawings, as such has heretofore been in use; neither does my invention relate to the construction or arrangement of the ashbox or fire-pot, and so far as the essential feature of my present invention relates to the method of supporting the boiler above the fire-pot I do not confine myself to any specific form or arrangement of either ash-box, firepot, or boiler, as these may be greatly modified.

What I claim as my invention, and desire to secure by Letters Patent, is

1. In a steam-generator, the combination, with a fire-pot, of a boiler placed over and above the fire-pot, said boiler being provided with lugs extending radially from its sides and beyond the walls of the fire-pot, and boilersupports beneath said lugs and disconnected with said fire-pot, whereby said boiler is supported independently of said fire-pot, substantially as described.

2. In a steam-generator, the combination,

with an ash-box and a fire-pot resting upon said ash-box, of a Water receptacle or boiler, a series of lugs attached to said boiler and extending radially outside of said boiler, and legs extending downward from said lugs to said ash-box and supporting said boiler, substantially as described.

3. In a steam-generator, the combination, with an ash-box and a fire-pot resting upon said ash-box, of aboiler provided with a crownsheet placed in a horizontal plane over said fire-pot and having a radius greater than the radius of said fire-pot, said boiler being supported at the outer edges of said crown-sheet and independently of said fire-pot, so as to leave a continuous space around the entire upper edge of said fire-pot, through which the products of combustion may pass, substantially as described.

4. In a steam-generator, the combination of an ash-box, a fire-pot resting upon said ashbox, a hemispherical water receptacle or boiler having a horizontal crown-sheet next the firepot, radial lugs projecting outwardly from the edge of said boiler, legs supporting said boiler and resting upon the ash-box, and adj ustingnuts upon said legs by which the vertical height of the boiler is adjusted, substantially as described.

5. The combination of ash-box A, fire-pot B, hemispherical boiler E, provided with a flange F, crown-sheet G, lugsH, legs J having a screw-threaded section, and adj usting-nuts K, all arranged substantially as described. HENRY O. FISH. Witnesses:

RUFUS B. FOWLER, II. M. FOWLER. 

